1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2de1bb310e6627e63692f63d92649f4a362a66eb37cf320ef4ca18775666af. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e35ce36-c312-4c9c-a228-7cb0eb87932c.json and https://artists.proofprofile.net/proofs/artist/0e35ce36-c312-4c9c-a228-7cb0eb87932c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Menahem Pressler - A 90th Birthday Celebration - Live in Paris
Dvořák: Piano Quintet in A Major, Op. 81, B. 155: I. Allegro ma non tanto
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b507a790daf592b123ef9d1e24e1fb0d8fd83602b971b9ebf550a21fdabd8e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1400013.
Dvořák: Piano Quintet in A Major, Op. 81, B. 155: II. Dumka. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238603a70604e5f2e26fa7d32148e2434adfd1e2b073d4fe963376f9bcc5b4f2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1400014.
Dvořák: Piano Quintet in A Major, Op. 81, B. 155: III. Scherzo. Furiant
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fce3c100f2adf811656fc8e130efee1aa37b59ea46980ce42f759a892390a3c. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1400015.
Dvořák: Piano Quintet in A Major, Op. 81, B. 155: IV. Finale. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287a85596c7434c495ae272978468d1a3854f5a2465d5ea640b5cf57e844d658. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1400016.
Schubert: Piano Quintet in A Major, Op. Posth. 114, D. 667 "The Trout": I. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66039684b70e96c64becf0c45c6d7442e3951e8f6b93532e1265f88d9dbd2c72. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1400017.
Schubert: Piano Quintet in A Major, Op. Posth. 114, D. 667 "The Trout": II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86153b28cf97c5c1563c83abd72c2c290b338319607a58f3dee9bdda55c677d8. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1400018.
Schubert: Piano Quintet in A Major, Op. Posth. 114, D. 667 "The Trout": III. Scherzo. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8966095113068fd5703870edab0579ffdb2ad2bac36545b9cafbef8b758230. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1400019.
Schubert: Piano Quintet in A Major, Op. Posth. 114, D. 667 "The Trout": IV. Tema con variazione. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ab299cb09586d62162885a7372f3a9e5ee9c7216e96f5f6642a6c96f2ea494. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1400020.
Ferré / Transc Ducros: Colloque sentimental
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5338c22778ce8f067fbe5710f3cafb5e9e2a964b7ff5fffc137e0045eec24d1. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1402760.
String Quartet in G Minor, Op. 10: II. Assez vif et bien rythmé
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09294d281ad59ab41cedf32b62e02340b0ffac5b2daef098fbd06d8936dddbc9. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0801965.
Trenet / Transc Ducros: Chanson d'automne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b019b65dcc0f47227f882e6def67207d9f4c21c62f6645d9ff47d0f62c8715. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1402789.
String Quartet in G Minor, Op. 10: III. Andantino (Doucement expressif)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c67273da5ac47f6e03da1dbfd1300ac9fcc22307c8a1004fdba89dd6b1f35e. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0801966.
Chabrier / Transcr. Ducros: Fisch-Ton-Kan: Air. "Qui je suis, qui je suis" (Fisch-Ton-Kan)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff12df281b1d5f7ba0a01c8652cb80a69591e3edc779a29a4a990798795857f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1402773.
String Quintet No. 3 in C Major, K. 515: II. Menuetto. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f58e8638b8b819fd5bccf02fa62692cf41d0975dd03b8a4fb9c0318fa0f783e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2201769.
String Quartet in G Minor, Op. 10: I. Animé et très décidé
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6f3c335cfb0fd831ef1b08897a1f2c233e946f2f4c6db956ea48468c1e157a. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0801964.
Arlen: Somewhere Over the Rainbow (from "The Wizard of Oz")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f16a294e766c6d79be065237fb3550be0c3f23f911119f0b9a3efe8bbca1767. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1001220.
String Quintet No. 3 in C Major, K. 515: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8fea19177946091f6bb51d298d8c6e81f474f1fc03e768a3f6ce91e473ec05. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2201771.